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Entanglement Density-Dependent Energy Absorption of Polycarbonate Films via Supersonic Fracture



Edwin P. Chan, Wanting Xie, Sara V. Orski, Jae-Hwang Lee, Christopher L. Soles


The fracture behavior of glassy polymers is strongly coupled to molecular parameters such as entanglement density as well as extrinsic parameters such as strain rate and test temperature. Here we use laser-induced impact projectile testing (LIPIT) to study the extreme strain rate $(\approx10^7$ s$^{-1})$ puncture behavior of free standing polycarbonate (PC) thin films. We demonstrate that changes to the PC molecular mass or the degree of plasticization can lead to substantial changes in the specific puncture energy. We relate these changes in the specific penetration energy to the alteration of the entanglement density of the polymer that determines the underlying failure mechanism as well as the size of the deformation zone.
ACS Macro Letters


high rate testing, polymer mechanics, LIPIT


Chan, E. , Xie, W. , Orski, S. , Lee, J. and Soles, C. (2019), Entanglement Density-Dependent Energy Absorption of Polycarbonate Films via Supersonic Fracture, ACS Macro Letters, [online], (Accessed May 18, 2024)


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Created June 18, 2019, Updated April 21, 2020